Generally when young pups are born (sharks) from an egg they generally feed from there yolk from anywhere 2 to 4 weeks, if you notice it may have a bit of a pot belly. Do Not try to feed him, you will notice when its time.......
way to go now the fun starts. When he gets usta feeding try hand feeding him. It is awesome I did that with my banded cat shark. He would even sit in my hand when i put my hand in the tank. They are awesome fish. Way to go again.